Monday, April 21, 2014

The line thought the two points (x,-8) and (3,5) has a slope of -7/2. Find the missing coordinate.

m=%28y%5B2%5D-y%5B1%5D%29%2F%28x%5B2%5D-x%5B1%5D%29
so...

-7%2F2=%28-8-5%29%2F%28x-3%29
and then we write

x-3=%28-2%2F7%29%28-13%29

x=26%2F7%2B21%2F7
x=47/7
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